Time and calendars

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Across
  1. 2. Measures short periods of time precisely.
  2. 5. Measures time with falling sand.
  3. 6. A period of 10 years.
  4. 8. Measures hours, minutes, and seconds.
  5. 11. Time Earth takes to orbit the sun.
Down
  1. 1. Based on the moon's cycle.
  2. 2. Uses shadows to show the time.
  3. 3. A tool to organize events in order.
  4. 4. Natural divisions of the year (spring, summer, fall, winter).
  5. 7. Tracks days, months, and years.
  6. 9. A period of 100 years.
  7. 10. Time it takes for Earth to rotate once.